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A Comparative Analysis of 3D Circle Fitting Algorithms for Determination of VLBI Antenna Reference Point
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 Title & Authors
A Comparative Analysis of 3D Circle Fitting Algorithms for Determination of VLBI Antenna Reference Point
Hyuk Gil, Kim; Jin Sang, Hwang; Hong Sik, Yun; Tae Jun, Jeong;
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The accuracy of reference point of VLBI antenna is mandatory to perform collocation of different space geodetic techniques. In this study, we evaluated the optimal methods for the 3D circle fitting to enhance the accuracy of the reference point of VLBI antenna. Two kinds of methodologies for the orthonormal coordinate system with translation of planar observation point and the unitary coordinate transforamation were suggested and their fitting accuracies were evaluated where the orthogonal distance was calculated by residual between observation point and fitting model and the recursive calculation was performed to improve the accuracy of 3D circle fitting. Finally, we found that the methodology for the unitary coordinate transformation is highly appropriate to determine the optimal equation for azimuth-axis and elevation-axis of VLBI antenna. Therefore, the reference point of VLBI antenna with high accuracy can be determined by the intersection of the above two axises (azimuth-axis and elevation-axis). This result is expected to be utilized for a variety of researches for connection between VLBI observation results and the national control point.
3D Circle Fitting;Co-location;VLBI;Antenna Reference Point;
 Cited by
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